Manufacture of casein.



UNITED STATES PATENT OFFICE.

HENRY V. DUNHAM, OF BAINBRIDGE, NEW YORK, ASSIGNOR TO OASEIN COMPANY OF AMERICA, OF NEW' YORK, N. Y., A CORPORATION-OF NEW-JERSEY. ,1

MANITFAOTURE OF CASE IN.

To all wh0mit may concern;-

- Be it known that I, HENRY V. DUNHAM, a

citizen of the United States, residing in,

same, have invented certain new and useful Improvementsin the Manufacture of Casein,

of which the following is a full, true, and con' cise specification.

My invention relates to the manufacture of casein and consists in the discovery of a practical and eflicient process for precipitat- '1ng casein from milk, whereby it is rendered serviceable, without further or unusual treatment, for use in arts in whichit has not heretofore found a ready market. As an instance of such.an art, I may mention the coating of wall-paper in which the color is made up ready for use in large rial.

When ordinary commercial casein, dissolved as usual in an alkali, is em loyed as the adhesive material, it is found t at it will not properly mix with the ulp colors, the latter becoming precipitate impair its spreading qualities, and also that such a coating solutlon will not keep sufto allow one to make up a quantity su 'ciently large to last amill even a few days. This vdeleterious action I believe to be due to the presence of a relatively v cipitating the be emplo large amount of alkali as the solvent for the casein, though it maybe due to other causes originating in the process employed for precasem from the m lk. 7 In any event, these objections are obviated by the present method of precipitation, and the casein produced according to my discovery may ed with superior results with acid colgs an in relations where casein "solutions of the ordinary alkalinity cannot be used.

, M invention involves also'other advantag in res ect of the cost of rnanufacture and the qua ity of the product. I 1

' process is carried outlas followsi Instea of usi acid, precipitating the milk by about one. pint to one quart of the ordinary com- Specification of Letters Patent. Application filed February 19, 1906. SerialNo. 301,905.

uantities by using anacid pulp and some ad esive mate-' or curdled to such an extentas to IIllIl, or at least seriously.

, and ninety-four V with about four undred parts of water, then any of the acids commonly used for our ling milk, I "use"hydrofluoric will i keep indefinitely e ad'y attained. Inany Patented Sept. 8, 1908..

case, enou h acid is used to thoroughly curdle the mill% and leave a clear su ernatant liquid, which is commonly called whey. I have found it more satisfactory to dilute the commercial acid with three or four, or more, parts of water, or to such an extent that itas no appreciable corrosive action .on glass, and then after having heated the milk,

about 120 F. or more, to sprinkle the acid thoroughly over the milk, stirringit rapidly into-the milk, when, in a few minutes, acomplete curdling takes place, the-curd settling to the bottom of the vessel, giving a clear, su-

ernatant, liquid. After this liquid or whey has been removedfrom the vessel'by any suitable means, the remaining curd may be Washed withwater, if desired,- to more thoroughly remove any portions' of the acid whichmay be left in it. It isthen dried by usual means, Well known in this art, and is ready for grinding or to be put upon the market.

The product of the above mentioned process is a caseinate of hydrofluoric acid, composed ofa small amount of hydrofluoric acid combined with the casein of the milk. It has the advantage of dissolving with a-very small amount 'of alkali. For example, one may easily dissolve it with seven per cent. of borax, whereas ordinary caseins now on the market require two or three times this amount of alkali. The product is also capab l eof being'made'to test absolutely. neutral, or to test s11 htlly acid to litmuspaper, and still be in a e ect ishing the amount of alkali to the oint where the casein is dissolved and is stil acid to litmus. I have found in a general 'wa which is contained in any suitable vessel, to

y dissolvedstate, by diminthat six parts of borax or equivalent alkai arts of casein, when mixed heated to about 150 R, will becomethoroughly dissolved and possess adhesive ropertles suitable for siz lng'purposes. an 'stlll remain acid-to litmus paper, with a result that this solution can be used in special lines of. industry, such as the wall aper colors above mentioned, and, at t e same time, will not cha e the shade of colors or curdle the colors so that the have no flowing properties. I have also ound thatthe product Having described my invention, what I without decomposing. i

'in Letters Patent No. 897,885.

5 treating milk with hydrofluoric acid in sufiicient quantity to precipitate the casein therefrom, and then separating the casein and Whey.

pound suitable for coating, which consists in curdling milk with commercial hydrofluoric ment in requiring correction, as follows:

the same may conform to the record 0 [SEAL.]

Correction 2. A process of producing a casein comi It is hereby certified that in L etters Patent No. 897,885,

upon the application of Henry V. Dunham,

the Manufacture of Casein, an error appears in Signedand sealed this 29th day of September, A. D.

quarts of milk and then separating the casein from the whey.

4. A composition of matter consisting of casein and hydrofluoric acid.

5. A solution for sizing purposes. consisting of approximatel 94% of casei'nate of hydrofluoric acid, an six per cent. of borax, mixed with water, substantially as described.

6. The method of producing casein from milk, which consists 1n adding to the milk substantially one tenth of one per cent. of hydrofluoric acid.

Inrtestimony whereof, I have signed my name to the specification in the presence of two subscribing witnesses.

HENRY "V. DUNHAM.

Witnesses: I WALTER J. ROLDER, LOUIS H. SMITH.

granted September 8, 1908, of Bainbridge, New York, for an improvethe printed specification In line 14, page 2, the word when should read then; and that the said Letters Patent should beread with this correction therein that f the case in the Patent Oflice.

Commissioner of Patents.

'in Letters Patent No. 897,885.

5 treating milk with hydrofluoric acid in sufiicient quantity to precipitate the casein therefrom, and then separating the casein and Whey.

pound suitable for coating, which consists in curdling milk with commercial hydrofluoric ment in requiring correction, as follows:

the same may conform to the record 0 [SEAL.]

Correction 2. A process of producing a casein comi It is hereby certified that in L etters Patent No. 897,885,

upon the application of Henry V. Dunham,

the Manufacture of Casein, an error appears in Signedand sealed this 29th day of September, A. D.

quarts of milk and then separating the casein from the whey.

4. A composition of matter consisting of casein and hydrofluoric acid.

5. A solution for sizing purposes. consisting of approximatel 94% of casei'nate of hydrofluoric acid, an six per cent. of borax, mixed with water, substantially as described.

6. The method of producing casein from milk, which consists 1n adding to the milk substantially one tenth of one per cent. of hydrofluoric acid.

Inrtestimony whereof, I have signed my name to the specification in the presence of two subscribing witnesses.

HENRY "V. DUNHAM.

Witnesses: I WALTER J. ROLDER, LOUIS H. SMITH.

granted September 8, 1908, of Bainbridge, New York, for an improvethe printed specification In line 14, page 2, the word when should read then; and that the said Letters Patent should beread with this correction therein that f the case in the Patent Oflice.

Commissioner of Patents.

Correction in Letters Patent No 897,885.

It is hereby certified that in Letters Patent No. 897,885, granted September 8, 1908, upon the application of Henry V. Dunham, of Bainbridge, New York, for an improvean error appears in the printed specification g ment in the Manufacture of Casein,

/ requiring correction, as follows: should read then; and that the said Letters Patent should be read with this correction therein that In line 14, page 2, the word when the same may conform to the record of the Signed and sealed this 29th day of September, A. D., 1908.

[SEAL] E. B. MOORE,

Commissioner of Patents. 

